/*
 * Copyright [2020] [MaxKey of copyright http://www.maxkey.top]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 

package org.dromara.maxkey.pretty.impl;

import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.dromara.maxkey.pretty.Pretty;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;

public class XmlPretty implements Pretty{

    static XmlPretty instance ;
    
    public XmlPretty() {

    }
    
    public static XmlPretty getInstance() {
        if (null == instance) {
            synchronized (JsonPretty.class) {
                if (instance == null) {
                    instance = new XmlPretty();
                }
            }
        }
        return instance;
    }
    
    @Override
    public  String format(String xmlString){
        try{
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            Document document = documentBuilder.parse(new InputSource(new StringReader(xmlString)));
            return format(document);
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }
    }
    
    public  String format(Node node){
        try{
            return XMLHelper.prettyPrintXML(node);
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }
    }

    @Override
    public String formatln(String source) {
        return LINE_BREAK + format(source);
    }
}
